“Jesse admitted to Sandra that he has cheated with seven women in total,” an insider close to the couple tells RadarOnline.com exclusively. “There are still women out there who haven’t come forward yet, and he’s hoping they don’t!”

Sources close to the actress tell RadarOnline.com that Sandra is completely humiliated by the news of his serial cheating ways going public and the more women that come forward, the more devastating it is for her.

Sandra has remained hidden from the public eye since news of the first mistress broke two weeks ago, but as RadarOnline.com previously reported, Bullock was spotted Wednesday night outside her Hollywood Hills home, surrounded by security.